create or replace function isnumber(myno varchar2)
return integer
is
v_string varchar2(20);
begin
v_string := to_number(myno);
return 1;
exception
when others then
return 0;
end;SQL> select isnumber('2436246264')
2 from dual;ISNUMBER('2436246264')
----------------------
1SQL> select isnumber('adf246246')
2 from dual;ISNUMBER('ADF246246')
---------------------
0
return integer
is
v_string varchar2(20);
begin
v_string := to_number(myno);
return 1;
exception
when others then
return 0;
end;SQL> select isnumber('2436246264')
2 from dual;ISNUMBER('2436246264')
----------------------
1SQL> select isnumber('adf246246')
2 from dual;ISNUMBER('ADF246246')
---------------------
0
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